Densitometric method (µg/spot) Fluorimetric method (µg/ml) Claimed taken Pure added R% of added Claimed taken Pure added R% of added 0.7 0.7 99.81 1.2 0.6 101.53 1 101.45 0.8 99.04 1.4 100.42 1.2 100.07 1.8 99.13 2.4 100.04 Mean ±SD   100.2 ± 0.9 100.17 ± 1.02

Table 4: Application of standard addition technique for the determination of zaleplon in its pharmaceutical preparation by the proposed methods.